<?php

/*
 * This file is part of SwiftMailer.
 * (c) 2004-2009 Chris Corbyn
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Writes data to a KeyCache using a stream.
 *
 * @package    Swift
 * @subpackage KeyCache
 * @author     Chris Corbyn
 */
class Swift_KeyCache_SimpleKeyCacheInputStream implements Swift_KeyCache_KeyCacheInputStream
{
	/** The KeyCache being written to */
	private $_keyCache;

	/** The nsKey of the KeyCache being written to */
	private $_nsKey;

	/** The itemKey of the KeyCache being written to */
	private $_itemKey;

	/** A stream to write through on each write() */
	private $_writeThrough = null;

	/**
	 * Set the KeyCache to wrap.
	 *
	 * @param Swift_KeyCache $keyCache
	 */
	public function setKeyCache(Swift_KeyCache $keyCache)
	{
		$this->_keyCache = $keyCache;
	}

	/**
	 * Specify a stream to write through for each write().
	 *
	 * @param Swift_InputByteStream $is
	 */
	public function setWriteThroughStream(Swift_InputByteStream $is)
	{
		$this->_writeThrough = $is;
	}

	/**
	 * Writes $bytes to the end of the stream.
	 *
	 * @param string $bytes
	 * @param Swift_InputByteStream $is optional
	 */
	public function write($bytes, Swift_InputByteStream $is = null)
	{
		$this->_keyCache->setString(
			$this->_nsKey, $this->_itemKey, $bytes, Swift_KeyCache::MODE_APPEND
		);
		if (isset($is)) {
			$is->write($bytes);
		}
		if (isset($this->_writeThrough)) {
			$this->_writeThrough->write($bytes);
		}
	}

	/**
	 * Not used.
	 */
	public function commit()
	{
	}

	/**
	 * Not used.
	 */
	public function bind(Swift_InputByteStream $is)
	{
	}

	/**
	 * Not used.
	 */
	public function unbind(Swift_InputByteStream $is)
	{
	}

	/**
	 * Flush the contents of the stream (empty it) and set the internal pointer
	 * to the beginning.
	 */
	public function flushBuffers()
	{
		$this->_keyCache->clearKey($this->_nsKey, $this->_itemKey);
	}

	/**
	 * Set the nsKey which will be written to.
	 *
	 * @param string $nsKey
	 */
	public function setNsKey($nsKey)
	{
		$this->_nsKey = $nsKey;
	}

	/**
	 * Set the itemKey which will be written to.
	 *
	 * @param string $itemKey
	 */
	public function setItemKey($itemKey)
	{
		$this->_itemKey = $itemKey;
	}

	/**
	 * Any implementation should be cloneable, allowing the clone to access a
	 * separate $nsKey and $itemKey.
	 */
	public function __clone()
	{
		$this->_writeThrough = null;
	}
}
